Site reliability engineers (SREs) play a vital role in maintaining production systems' reliability, performance, and scalability by utilizing various tools across multiple categories, such as monitoring/observability, on-call and incident management, configuration, and automation. Essential tools highlighted include Prometheus and Grafana for monitoring and visualization, Datadog and New Relic for comprehensive observability, PagerDuty and Incident.io for efficient incident management, and Jenkins and Terraform for automation and infrastructure management. Additionally, internal developer portals like Port and Backstage facilitate streamlined software delivery and incident management. These tools collectively enable SREs to effectively monitor, automate, and manage systems, ensuring they meet modern infrastructure and application demands.